  let mog = require('../index');
  
  // 5. 创建文档解构 new mongoose.Schema()
  let songSchema = new mog.Schema({
    name:String,
    singer:String,
    price:Number
})
    // 6. 创建模型对象 mongoose.model()
let songModel = mog.model('songs',songSchema);

module.exports = songModel;